@caioprezia Thank you so much, Caio!! 
I greatly appreciate it! 
Thatâs a great question â I probably wouldnât recommend having two apps, but it is possible to allow Users to login to a second Bubble app, using their credentials from the main app. This way, they wouldnât have to re-signup for the second app.
Once the App Connector plugin is setup between your main app and the second app, Bubble will allow you to use the âSignup/Login with a social networkâ action in place of the templateâs default signup/login actions:
(After selecting that action and configuring the App Connector plugin with your main app, Bubble will allow you to select the main app from the âOAuth providerâ dropdown)
As long as the Current User is currently logged into your main app, Bubble will signup or login the User to that account in the second app. After the signup action, you would then also need to âimportâ the Current Userâs name and profile picture so theyâre shown in the second app on the messaging page 
(hereâs an example):
With that said, these applications would be completely separate, and if you were to ever need to write/retrieve data from the template app into the main app in the future, that would require significant changes to the templateâs setup. In the future, I hope itâs easier to âcombineâ an existing app with a template app so you wonât need to do this, but this is probably as close as it can be at the moment. I hope that helps, but please let me know if I can clarify anything or if you have any other questions!